De Finetti's diagram contains a curved line representing this condition's namesake frequency. This condition only occurs in the presence of random mating and no mutations, and it is mathematically represented by the equation 
De Finetti's diagram contains a curved line representing this condition's namesake frequency. This condition only occurs in the presence of random mating and no mutations, and it is mathematically represented by the equation p squared plus two p q plus q squared equals one. For 10 points, name this condition from population genetics in which allele and genotype frequencies in a stable population tend remain to constant, named for two scientists.
De Finetti's diagram contains a curved line representing this condition's namesake frequency.
{Hardy}-{Weinberg} equilibrium [accept {words} like “{principle}” or “{hypothesis}” for “equilibrium”; accept names in either order]